Learn Finnish: Langaton reititin jumiutuu usein. - The wireless router freezes often.

Langaton comes from the noun lanka (thread, yarn, or wire) combined with the suffix -ton, which means "without". Literally, it means "without wire". Notice the consonant gradation: the nk in lanka softens to ng when the suffix is added.

Where does the word reititin (router) come from?

It is built from the noun reitti (route). The -in suffix at the end is very commonly used in Finnish to name tools, instruments, or machines that perform a specific task. A reititin is simply a device that routes.

Why use jumiutuu instead of other verbs for being stuck or frozen?

The verb jumiutua comes from the noun jumi (a jam or blockage). The -utua ending makes it an automative verb, meaning something happens by itself or undergoes a change of state. It perfectly describes a machine like a router freezing or getting stuck on its own without a user doing it.

This lesson covers the conjunction joten (so / therefore). How could we add it to this sentence?

Joten introduces a consequence based on the whole previous clause. You could say: Langaton reititin jumiutuu usein, joten ostan uuden (The wireless router freezes often, so I will buy a new one). Remember to always put a comma before joten.